I found new videos, here very hot comparisons between original models and clones, well i can't go away from it so easy.

On arene two consoles "Mega Drive" and new clone of 2010 year "RetroN3"

http://www.youtube.com/watch?v=xbmPh643zTs&feature

And emulated consoles in Retrocopy (my videos)

Genesis
http://www.youtube.com/watch?v=dlPYRNZYtaw&feature

SMD2 clone
http://www.youtube.com/watch?v=aOFdRp2YfjI&feature

New clone "RetroN3" has very loud PSG, looks like this console not have capacitors at all, and this mean, what volumes can't be balanced properly.

The PSG volume really bothered me. I put mine in RetroCopy to 0.6
Should be much closer to the real thing.

yeah for Genesis it almost close, here accurate values:

<float name="smspsg_chan4_preamp" value="0.150000" />
<float name="smspsg_chan3_preamp" value="0.100000" />
<float name="smspsg_chan2_preamp" value="0.100000" />
<float name="smspsg_chan1_preamp" value="0.100000" />
<float name="megadrive_ymvolume" value="1.000000" />
<float name="megadrive_psgvolume" value="0.570000" />

These settings (As auto presets) applied by default in 0.970 for Genesis\Mega Drive 1\Genesis 2

Now each console model's has own properties.